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    <title>Document</title>
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    <script>
      var str = "abcdabcdabcdeabceabcdef";
      function countstr(str) {
        var obj = {};
        for (var i = 0; i < str.length; i++) {
          obj[str[i]] = 0;
        }
        for (var i = 0; i < str.length; i++) {
          for (var k in obj) {
            if (str[i] == k) {
              obj[k] += 1;
            }
          }
        }
        return obj;
      }
      console.log(countstr(str));
    </script>
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